Graphene-modified conductive silver paste and preparation method thereof

Abstract

The invention provides a graphene-modified conductive silver paste and a preparation method thereof. The graphene-modified conductive silver paste mainly comprises silver nanowires, graphene materials, a binder and a solvent. The graphene materials comprise one or a combination of at least two materials selected from graphene, a graphene nanosheet, biomass graphene or graphene oxide. According to the technical scheme of the invention, the silver nanowires and the graphene materials are adopted together as an electrically conductive agent, and the silver nanowires are filled into gaps among graphene material sheet layers. Therefore, the graphene material sheet layers are connected in series through the silver nanowires, and the above two parts play a synergistic effect to realize the conductive performance. Meanwhile, the graphene materials are covered on the surfaces of the silver nanowires, so that the oxidation of the silver nanowires is avoided. The system stability and the stable exertion of the conductive performance are better ensured. Moreover, by means of the binder and other components, the adhesive force of the system is improved obviously. The printability of the conductive silver paste is improved.

Description

technical field [0001] The invention belongs to the field of conductive paste, and relates to a graphene-based conductive silver paste and a preparation method thereof. Background technique [0002] Conductive silver paste is a mixed paste composed of high-purity metallic silver particles, binders, solvents, and additives. Today, with the rapid development of the electronic information industry, the demand for conductive paste is increasing day by day, and it has become an indispensable material in the electronics industry such as solar cells and printed circuits. However, the price of conductive silver paste is relatively high due to the high price of metallic silver. . [0003] At present, in order to meet the high conductivity requirements of electronic products, the solid content of silver in the conductive silver paste is 60-90%. The high content of silver particles not only greatly increases the preparation cost, but also reduces the content of the binder, resulting i...

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Problems solved by technology

Among them, the nano additives can choose graphene nanosheets, but the amount of nano silver is still a lot, and the conductivity needs to be further improved

[0007] Disclosed in CN105936769A is a graphene-modified nano-silver water-based conductive ink and a preparation method thereof. The graphene-modified nano-silver water-based conductive ink includes the following substances: 0.02-3 parts of nano-silver, graphene modification auxiliary agent 0.001-3 parts, 0.02-10 parts of nitrocellulose, 0.001-3 parts of cetyltrimethylammonium chloride, 0.001-3 parts of organically modified polydimethylsiloxane, 0.001-3 parts of dispersant, 0.1-2 parts of wetting agent, 70-100 parts of organic solvent, in its preparation method, the graphene modification additive, nitrocellulose, cetyltrimethylammonium chloride and organic modified polydimethyl directly mixed with base siloxane, etc., the conductive performance of the prepared conductive ink needs to be further improved due to the possible agglomeration of graphene

[0008] In practical applications, graphene sheets are prone to aggregation, and the amount of graphene added to the slurry is very low, which affects the performance of graphene, which is obviously not conducive to popularization and application.

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